What is the particle size that the RO pre-filter protects the RO machine from?

The correct answer is 5 micron because the reverse osmosis (RO) pre-filter is designed to remove particulate matter from the water supply before it enters the RO membrane. The primary function of this pre-filter is to protect the more delicate RO membrane by trapping larger particles and sediments, which can cause clogging or damage to the membrane.

A pre-filter that targets 5 micron particles effectively captures a range of contaminants such as sand, silt, and larger bacteria, helping to ensure that only cleaner water reaches the RO membrane. This is vital for maintaining the efficiency and longevity of the RO system, as even small amounts of sediment can significantly impact performance and lead to increased maintenance or early replacement of the membrane.

Particles smaller than 5 microns may still pass through the pre-filter, but because the focus is on 5 microns, this level of filtration is typically sufficient to protect the system without unnecessarily restricting water flow or requiring overly complex filtration solutions.